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A193490 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 1
9 8
10 15
11 70
12 165
13 608
14 1601
15 5259
16 14564
17 45040
18 127521
19 381691
20 1090130
21 3202382
22 9171574
23 26642413
24 76312777
25 220134939
26 629965221
27 1808975528
28 5170502225
29 14801940226
30 42257089390

[0,0,0,0,0,0,1,1,8,15,70,165,608,1601,5259,14564,
 45040,127521,381691,1090130,3202382,9171574,
 26642413,76312777,220134939,629965221,1808975528,
 5170502225,14801940226,42257089390]

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Last modified April 25 04:42 EDT 2024. Contains 371964 sequences. (Running on oeis4.)